FiltersAvailable
Filter Q Factor & Bandwidth Calculator
Calculate filter Q factor, bandwidth, center frequency, cutoff frequencies, fractional bandwidth, and damping ratio reference values.
Calculator category
Filter Calculators
Design and analyze passive and active electronic filters, cutoff frequencies, bandwidth, resonance, and frequency response.
Available Calculators
12
Engineering Applications
6
Calculators
Each listed tool links to a working calculator with engineering inputs, formulas, examples, notes, and related resources.
FiltersAvailable
RLC Filter Calculator
Analyze ideal series and parallel RLC resonance, Q factor, bandwidth, impedance, magnitude response, phase, and frequency sweep tables.
FiltersAvailable
RL Filter Calculator
Analyze ideal RL low-pass and high-pass filters, cutoff frequency, time constant, inductive reactance, impedance, gain, phase, component values, and sweep tables.
FiltersAvailable
LC Filter Calculator
Analyze loaded LC low-pass and high-pass filters, characteristic frequency, Q factor, damping, actual -3 dB frequency, peaking, component values, and sweep tables.
FiltersAvailable
Sallen-Key Low-Pass Filter Calculator
Design and analyze ideal second-order Sallen-Key low-pass filters, including natural frequency, Q, damping, Butterworth gain, peaking, op-amp gain resistors, and sweep tables.
FiltersAvailable
Sallen-Key High-Pass Filter Calculator
Design and analyze ideal second-order Sallen-Key high-pass filters, including natural frequency, Q, damping, Butterworth gain, passband-relative cutoff, op-amp gain resistors, and sweep tables.
FiltersAvailable
Multiple-Feedback Band-Pass Filter Calculator
Design and analyze ideal second-order multiple-feedback active band-pass filters with center frequency, Q, bandwidth, center gain, exact half-power frequencies, phase, and sweep tables.
FiltersAvailable
Notch Filter Calculator
Design balanced Twin-T notch filters, calculate 50 Hz and 60 Hz rejection targets, estimate notch frequency, component ratios, tolerance envelope, Q, bandwidth, and ideal response.
FiltersAvailable
Butterworth Filter Calculator
Calculate Butterworth filter order, cutoff frequency, low-pass and high-pass response, normalized poles, stage Q values, and bounded sweep tables.
FiltersAvailable
PWM Low-Pass Filter Calculator
Calculate PWM average voltage, RC cutoff, carrier attenuation, exact steady-state ripple, settling time, and harmonic components.
FiltersAvailable
ADC Anti-Alias Filter Calculator
Plan ADC anti-alias filters with Nyquist frequency, alias folding, guard band, Butterworth order, and residual alias targets.
FiltersAvailable
Pi Filter Calculator
Analyze passive CLC and CRC pi filters for ripple attenuation, loaded response, resonance reference, DC voltage drop, and sweep behavior.
How to Use These Calculators
Start From the Engineering Question
Choose the calculator that matches the decision you need to make: decode a component marking, size a value, check a frequency response, estimate loss, or verify a safety margin. A category page is useful only when it helps you reach a working tool, so this page lists released calculators only.
Check Units and Assumptions
Calculator results depend on unit choices, idealized formulas, tolerance, temperature, frequency range, and component limitations. Review the formula and engineering notes on each calculator page before using the result in a schematic, BOM, or PCB layout.
Validate Against Real Parts
Use the calculated value as a design reference, then confirm it against datasheets, derating curves, layout parasitics, measurement conditions, and manufacturer limits. The related guides below provide background when a calculation needs more context.
Engineering Applications
Cutoff frequency
Bandwidth
Resonance
Q factor
Fractional bandwidth
Active filter design
Related Engineering Guides
Engineering Guide
Measuring Filter Response: Cutoff, Bandwidth, Q, Phase, and Loading
Measure an assembled analog filter with controlled source, load, probes, stimulus, and sweep resolution, then extract loaded cutoff, bandwidth, Q, and phase.
10 min · Intermediate
Engineering Guide
Twin-T Notch Filter Design: Matching, Depth, Trimming, and Measurement
Design balanced passive Twin-T ratios, then distinguish nominal notch frequency from finite depth while managing loading, drift, trimming, and bench validation.
10 min · Intermediate
Engineering Guide
Multiple-Feedback Band-Pass Design: Q, Gain, Tolerance, and Validation
Carry MFB band-pass frequency, Q, signed gain, real component ratios, op-amp limits, and measured half-power points through one explicit topology.
15 min · Advanced
Engineering Guide
Active and Application-Specific Filter Topologies
Compare Sallen-Key, multiple-feedback, Twin-T notch, PWM smoothing, ADC anti-alias, and CLC or CRC pi filters with practical loading and tolerance checks.
22 min · Intermediate
Engineering Guide
Butterworth Filter Design: Order, Poles, Stage Q, and Cascaded Verification
Design Butterworth low-pass and high-pass filters from attenuation requirements through order, cutoff, normalized poles, stage Q, cascade implementation, tolerance, and verification.
18 min · Intermediate
Engineering Guide
Passive Filter Component Nonidealities: ESR, ESL, DCR, Q, and Self-Resonance
Design practical passive filters with capacitor ESR and ESL, inductor DCR, Q and self-resonance, loading, tolerance, damping, layout, and measured response.
18 min · Intermediate to Advanced
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